Nanomachines & Nanomanipulation Advanced Electron Microscopy

The Advanced Electron Microscopy group at INL is involved in understanding the atomic structure of materials (energy related and catalytically important materials) and correlating it with their properties using a combination of electron microscopic and spectroscopic tools. Understanding the structure of materials is fundamental to exploring their various interesting properties: magnetic, optical and optoelectronic. The studies are carried out by employing the state-of-the art aberration corrected S/TEM in combination with analytical electron microscopy to provide combined atomic structure – chemical sensitive information. 

Book Chapters

Advanced Methods of Electron Microscopy in Catalysis Research, Miguel Jose-Yacaman, Arturo Ponce-Pedraza, Sergio Mejía-Rosales and Francis Leonard Deepak, Advances in Imaging & Electron Physics (Academic Press), Editor: Peter Hawkes, vol. 177, pp: 279-342 (2013)

Journals and Books edited

Advanced Transmission Electron Microscopy: Applications to Nanomaterials Eds: Francis Leonard Deepak, Alvaro Mayoral and Raul Arenal, Springer (2015). 


Nanomaterial Properties: Size and Shape Dependencies, Grégory Guisbiers, Sergio Mejía-Rosales, and Francis Leonard Deepak, J. Nanomaterials, Volume 2012 Articles ID 180976, 2012).

Group Publications


(30) Controlling Bimetallic Nanostructures by the Microemulsion Method with Subnanometer Resolution Using a Prediction Model, David Buceta, Concha Tojo, Miomir Vukmirovic, Francis Leonard Deepak, Arturo M. Lopez-Quintela, Langmuir. 2015, 31, 7435-7439.

(29) Wavelength Dispersion of Raman Enhancement in Silver-Gold Nanocages, Angela Zoppi, Silvana Trigari, Francis Leonard Deepak Emilia Giorgetti, Phys. Chem. Chem. Phys. 2015, 17, 7355-7365.

(28) A Systematic Study of the Structural and Magnetic Properties of Mn-,Co, and Ni-Doped Colloidal Magnetite Nanoparticles, Francis Leonard Deepak Manuel Bañobre-López, , Enrique Carbó-Argibay, M. Fátima Cerqueira, Yolanda Piñeiro-Redondo, José Rivas, Corey M. Thompson, Saeed Kamali, Carlos Rodríguez-Abreu, Kirill Kovnir, and Yury V. Kolenko, J. Phys. Chem. C 2015, 119, 11947 – 11957.

(27) Self-assembled functionalized graphene nanoribbons from carbon nanotubes, Eunice Cunha,  M. Fernanda Proença, Florinda Costa, António J. Fernandes,  Marta A. C. Ferro, Paulo E. C. Lopes, Mariam Debs, Manuel Melle-Franco, Francis Leonard Deepak,  Maria C. Paiva, ChemistryOpen 2015, 4, 115 – 119.

(26) Impact of MgO thickness on the performance of Spin Transfer Torque Nano-Oscillators, J. D. Costa, S. Serrano-Guisan, J. Borme, F. L. Deepak, M. Tarequzzaman, E. Paz, J.Ventura, R. Ferreira and P.P. Freitas1 IEEE Trans. Magn. 2015.

(25) Synthesis and characterization of Spiky nickel nanoparticles-decorated reduced graphene oxide for catalytic applications, Maryam Salimian, Elby Titus, Francis Leonard Deepak, Gil Goncalves, Igor Bdkin, Joao Ventura, Catarina C Dias, Marta Ferro, Olena Okhay,  Jose Gracio, In Press, J. Mater. Chem. C.


(24) Understanding the structure of nanocatalysts with High Resolution Scanning/ Transmission Electron Microscopy Francis Leonard Deepak, Jose Rivas, Miguel Jose-Yacaman, IOP Conf. Ser.: Mater. Sci. Eng. 55, 012005 (2014).

(23) Plasmonic response of DNA-Assembled Gold Nanorods (AuNRs), Stephanie Vial, Dmytro Nykypanchuk, Francis Leonard Deepak, Marta Prado, and Oleg Gang, Journal of Colloid and Interface Science, 433, 34-42 (2014).

(22) High-Temperature Magnetism as a Probe for Structural and Compositional Uniformity in Ligand-Capped Magnetite Nanoparticles, Yury V. Kolen’ko, Manuel Bañobre-López, Carlos Rodríguez-Abreu, Enrique Carbó-Argibay, Francis Leonard Deepak, Dmitri Y. Petrovykh, M. Fátima Cerqueira, Saeed Kamali, Kirill Kovnir, Dmitry V. Shtansky, Oleg I. Lebedev, and Jose Rivas, J. Phys. Chem. C 2014, 118, 28322−28329.

(21) Linear nanometric tunnel junction sensors with exchange pinned sensing layer, Ana V. Silva, Diana C. Leitao, Ricardo Ferreira, Elvira Paz, Francis Leonard Deepak, Susana Cardoso, and Paulo P. Freitas, Journal of Applied Physics, 115, 17E526 (2014).

(20) Nanoscale Magnetic Tunnel Junction sensing devices with soft pinned sensing layer and low aspect ratio, Diana C. Leitao, Elvira Paz, Ana V. Silva, Anastasiia Moskaltsova, Simon Knudde, Francis L. Deepak, Ricardo Ferreira, Susana Cardoso and Paulo P. Freitas, IEEE Transactions on Magnetics, vol. 50, pp. 4410508, Nov 2014.


(19) Ag nanowires as precursors to synthesize novel Ag-CeO2 nanotubes for H2 production by methanol reforming, Raúl Pérez-Hernández, Claudia E. Gutiérrez-Wing, Gilberto Mondragón-Galicia, Albina Gutiérrez-Martínez, Francis Leonard Deepak, Demetrio Mendoza-Anaya, Cat. Today, 212, 225-231 (2013) (Special Issue: Selected Contributions of the Fourth International Symposium on New Catalytic  Materials (NCM-4)).

(18) A novel and high yield synthesis of CdSe nanowires, M. F. Meléndrez, K. Hanks, Francis Leonard-Deepak, F. Solis-Pomar, E. Martinez-Guerra, E. Pérez-Tijerina and M. José-Yacaman, J. Mat. Sci. 48, 4983-4988 (2013).

(17) Switching field variation in MgO magnetic tunnel junction nanopillars: experimental results and micromagnetic simulations, Ana V. Silva, Diana C. Leitao, Zhiwei. Huo, Rita J. Macedo, Ricardo Ferreira, Elvira Paz, Francis Leonard Deepak, Susana Cardoso, and Paulo P. Freitas, IEEE Trans. Magn. 49 (7), 4405-4408 (2013).

(16) MgO Magnetic Tunnel Junction Electrical Current Sensor with Integrated Ru Thermal Sensor, Antonio Lopes, Susana Cardoso, Ricardo Ferreira, Elvira Paz, Francis Leonard Deepak, Jaime Sanchez, Diego Ramirez, Sergio I. Ravelo and Paulo P. Freitas, IEEE Trans. Magn. 49 (7), 3866-3869 (2013).


(15) On the structure of bimetallic noble metal nanoparticles as revealed by aberration corrected scanning transmission electron microscopy (STEM), A. Mayoral, Francis Leonard Deepak, Rodrigo Esparza, Gilberto Casillas, Cesar Magen, Eduardo Perez-Tijerina, Miguel Jose-Yacaman, Micron, 43, 557-564 (2012) [REVIEW].

(14) Physicochemical Characterization, and Relaxometry Studies of Micro-Graphite Oxide, Graphene Nanoplatelets, and Nanoribbons, Bhavna S. Paratala, Barry D. Jacobson, Shruthi Kanakia, Francis Leonard Deepak, Balaji Sitharaman, PLOS ONE, 7(6), e38185 (2012).

(13) Growth of aligned ZnO nanorods on transparent electrodes by hybrid methods, M. F. Meléndrez, K. Hanks, Francis Leonard-Deepak, F.  Solis-Pomar, E. Martinez-Guerra, E. Pérez-Tijerina and M. José- Yacaman, J. Mat. Sci. 47, 2025-2032 (2012) (From the issue entitled  "Special Section: E-MRS MACAN; Guest Editors: D. Chatain, M. Finnis and C. Scheu").

(12) Insights into the Structure of MoS2/WS2 Nanomaterial Catalysts as Revealed by aberration Corrected STEM, Francis Leonard Deepak, Rodrigo Esparza, Carlos Fernando Castro-Guerrero, Sergio Mejía-Rosales, Xochitl Lopez-Lozano, and Miguel Jose-Yacaman, Microscopy and Microanalysis, 18 (5), 65-66 (2012).  


(11) D.H. Galvan, Francis Leonard Deepak, Rodrigo Esparza, A. Posada-Amarillas, R. Nunez-Gonzalez, X. Lopez-Lozano, M. Jose-Yacaman, Experimental and theoretical properties of S–Mo–Co–S  clusters, Applied Catalysis A: General 397, 46–53 (2011).

(10) Francis Leonard Deepak, Raúl Pérez Hernández, Juan Cruz-Reyes, Sergio Fuentes, Miguel Jose Yacaman, Catalytic activity of MoS2 nanotubes in the Hydrodesulphurization reaction of Dibenzothiophene, (SIXTH INTERNATIONAL TOPICAL MEETING ON NANOSTRUCTURED MATERIALS AND NANOTECHNOLOGY, San Carlos, Nuevo Guaymas, Mexico, NANOTECH 2009) Revista Mexicana de Física, S 57, (2) 1–6, (2011).

(9) Francis Leonard Deepak, Rodrigo Esparza, Belsay Borges, Xochitl Lopez-Lozano and Miguel Jose-Yacaman, Direct Imaging and Identification of Individual Dopant Atoms in MoS2 and WS2 Catalysts by Aberration Corrected Scanning Transmission Electron Microscopy ACS Catalysis, 1 (5), 537–543 (2011).

(8) Francis Leonard Deepak, Gilberto Casillas-Garcia, Rodrigo Esparza, H. Barron and Miguel Jose-Yacaman, New insights into the structure of Pd–Au nanoparticles as revealed by aberration-corrected STEM Journal of Crystal Growth, 325 (1), 60-67 (2011).

(7) Carlos Fernando Castro-Guerrero, Francis Leonard Deepak, Arturo Ponce, Juan Cruz-Reyes, Mario Del Valle-Granados, Sergio Fuentes-Moyado, D. H. Galvan and Miguel Jose-Yacaman, Structure and catalytic properties of hexagonal molybdenum disulfide nanoplates, Catalysis  Science & Technology, 1, 1024-1031 (2011).

(6) Francis Leonard Deepak, Rodrigo Esparza, Belsay Borges, Xochitl Lopez-Lozano, Miguel Jose-Yacaman, Rippled and Helical MoS2 Nanowire Catalysts: An Aberration Corrected STEM Study, Catal Lett. 141, 518–524 (2011).

(5) M. O. Montes-Holguin, A. Mayoral, F. L. Deepak, J. R. Peralta-Videa, M. Jose-Yacamán, J. L. Gardea-Torresdey, Anisotropic gold nanoparticles and gold plates biosynthesis using falfa extracts, J. Nanoparticle Research, 13, 3113–3121 (2011).

(4) M. Reza Nejadnik, Francis L. Deepak, Carlos D. Garcia, Adsorption of Glucose Oxidase to 3-D Scaffolds of Carbon Nanotubes: Analytical Applications, Electroanalysis, 23, 1462-1469 (2011).

(3) J. Jesús Velázquez-Salazar, Rodrigo Esparza, Sergio Mejía-Rosales, Rubén Estrada-Salas, Arturo Ponce, Francis Leonard Deepak, and Miguel José-Yacamán, Experimental Evidence of Icosahedral and Decahedral Packing in One-Dimensional Nanostructures, ACS Nano, 5 (8), 6272–6278 (2011).

(2) Structural transformation of tungsten oxide nanourchins into IF– WS2 nanoparticles: an aberration corrected STEM study, Francis Leonard Deepak, Carlos Fernando Castro-Guerrero, Sergio Mejıa-Rosales and Miguel Jose-Yacaman, Nanoscale, 3, 5076-5082 (2011).

(1) Alvaro Mayoral, Rodrigo Esparza, Francis Leonard Deepak, Gilberto Casillas, Miguel se-Yacaman, Study of nanoparticles at UTSA: one year of using the first ARM-200 installed in USA, JEOL News, 46, 1-5 (2011) [REVIEW].


Group manager Leonard Deepak Francis